JPS5928909Y2 - Agricultural vehicle running operation structure - Google Patents

Description

[Detailed description of the invention] The present invention relates to the running operation structure of a farm vehicle, and the present invention enables continuously variable shifting with an inexpensive configuration, and also allows high/low shifting and stopping of running without losing the front/rear. According to =
The purpose of the present invention is to automatically perform a clutch engagement and disengagement operation when switching between forward and backward speeds so that a series of gear shifting operations can be performed extremely well.

Next, embodiments of the present invention will be described in detail with reference to the drawings.

A lifting device 1 that pulls up planted stem culms in the field, a reaping device 2 that reaps the lifted stem culms, and a reaping device 2 that reaps the lifted stem culms.While conveying the cut stem culms to the rear and upper part of the machine, the machine changes its posture to a sideways posture and is received by the feed chain 3. A vertical conveyance device 4 for passing, and a threshing device 5 for threshing the harvested stem culms while being held and conveyed by a feed chain 3 are sequentially installed in a traveling tank body equipped with a crawler traveling device 6 and equipped with a control section I. The combine harvester, which is an example of an agricultural work vehicle, is configured so that it can continuously harvest and process planted stems and culms in the field as it travels.

To drive the crawler traveling device 6, a counter ← pongee 10 is connected to the engine output shaft 8 via a gear transmission mechanism 9, and an output and input pulley 13 is connected to an input shaft 12 protruding from the transmission case 11, respectively. 14, and a transmission belt 15 is wound around both pulleys 13 and 14, in order to transmit power from the engines E and 1 to the traveling drive shafts 16 of the left and right crawler traveling devices 6, 6 via the transmission M. It is composed.

Said both boo! , 113, and 14 are each composed of split pulleys, and one Boo! Seven pieces 13a and 14a are provided slidably in the axial direction of the counter shaft 10 and input shaft 12, respectively, and a single-acting cylinder 18 is interlocked and connected to the output side boob piece 13a via a contact rod 17. On the other hand, a compression spring 19 is attached to the input side pulley piece 14a and is always biased toward the side approaching the other fixed side pulley piece 14b, and the operation of the cylinder 18 causes transmission to the output pulley 13 and input pulley 14. The belt 150 wraps around the belt 150 to change the diameter ratio and configure the belt-type continuously variable transmission 20 to continuously change the driving speed.

As shown in FIG. 3, a pair of bent-back links 22 and 23 are connected to the spool 21 of the control pulp V for the cylinder 18, and the husband's free end side link 22
a, 23a are provided to be swingable around the fixed axis 41, and the lever member 2 is in a state where it can act on both links 22a, 23a.
4 is provided to be swingable around the fixed shaft core 22, and an operating lever 25 is connected to the lever member 24 so as to be swingable around the shaft P3 which is orthogonal to the shaft P2. 25 to the sliding member 26, the axis P
held through a long hole 27 drilled in the direction along 3;
The sliding member 26 and the fork 29 for the shift gear (gear-type forward/reverse switching device) 28 for switching forward/reverse in the mission case 11 are connected to the bell crank 30 and the rod 3.
1, and the lever 25 is connected to the guide groove 3.
2, the transmission device 25 and the forward/reverse/stop switching device 33 are linked to perform the forward/reverse switching operation by swinging the operating lever 25 around the axis 23, and the lever member By swinging around the axis 22 when integrated with the control lever 24, the gear shift operation can be performed within a predetermined height range while the front and back are lost. The structure is such that low-speed forward movement, stopping, low-speed reverse movement, and high-speed forward movement can be achieved in that order and reversibly.

Said bent link 22, 2: R: Free end side link 22a
, 23a are collectively referred to as a speed change operation mechanism that is linked only to the back and forth swinging operation of the lever 25 and exchanges the back and forth swinging of the lever 25 from the neutral position force to the away force and the forward side to a unidirectional operation. do.

Further, the sliding member 26, the bell crank 30, and the rod 31 are collectively referred to as a forward/reverse switching mechanism that is linked only to the left and right swinging of the lever 25.

The valve box 34 of the control valve V and the contact rod 17 are interlocked and connected via the interlocking mechanism A, and the valve box 34 is moved to the neutral side of the valve V by following the displacement of the contact rod 17 due to cylinder operation. It is configured to be displaced, and is configured to obtain a speed corresponding to the amount of rocking displacement of the operating lever 25 around the axis 22.

A friction type clutch 36 is provided between the input shaft 12 and the fixed pulley piece 14b of the input turn 914 located on the upper side of the switching device 33, and is always biased toward the input side via a spring 35. , a solenoid S is attached to a member 37 that receives one end side of the spring 35, and a solenoid S is attached to the solenoid S in order to be placed close to the foot pedal 38 disposed in the control section 7 and to be activated when the foot pedal 38 is depressed. A five-touch inch L1 is provided, and the solenoid S is energized by operating the pedal 38, and the clutch 36 is disengaged.

As shown in FIG. 4, the lower part of the lever guide frame 39 in which the guide groove (crank groove) 32 is formed has a wavy, sword-shaped groove.
One end of the lever 25 is fixed, and an elastic operating piece 40 is provided on the free end of the lever 5 so as to be close to the switch L2.
When the operating lever 25 moves reversibly from both ends of the horizontal neutral groove portion 32a to the central position N due to the swinging operation around the axis 23 for forward/backward switching, the operating lever 25 moves toward the protrusion 41° 41 of the operating piece 40. The switch L2 is connected to the limit switch L1 in a circuit for the solenoid S.
The clutch 36 is connected in parallel with the clutch 36, and is configured so that in a series of operations of the operating lever 25, the disengaged state of the clutch 36 is automatically obtained when the operating lever 25 is switched to forward or reverse.

Note that the belt type continuously variable transmission 20 is not limited to the split pulley type; for example, a transmission belt may be wound around a truncated cone-shaped winding drum and the winding drum may be displaced in the direction of its rotational axis. Various structural modifications are possible, such as making it continuously variable speed.

The above are examples of the present invention.

As explained in this embodiment, the structural features of the present invention are as follows.

That is, in the power transmission system between the output shaft 8 of the engine E and the traveling device 6, there is a latch 36 and a gear type continuously variable transmission 20 running from the upper side of the transmission force to the lower side. In a running operation structure for an agricultural vehicle in which a forward/reverse switching device 28 is installed in order, one operating lever 25 is pivotally supported so as to be swingable back and forth and left/right, and a neutral groove portion 32 along the left/right direction is provided.
The lever 25 is inserted into the crank groove 32 of the lever guide frame 39, which is formed by extending a groove portion forward from one end side and rearward from the other end side, so that the lever 25 can be swung from side to side. The lever 25 and the gear-type forward/reverse switching device 28 are linked via a forward/backward switching mechanism that is linked only to the operation of the lever 25.
The lever 25 and the belt are connected to each other through a speed change operation mechanism that is linked only to the back and forth swinging operation of the lever 25 and converts the back and forth swinging of the lever 25 from the neutral position force to the far side to the side into a one-way operation. The lever 25 is linked with the continuously variable transmission 20 of the type.
It is configured to select forward and backward movement by swinging left and right of the lever 25, and to increase the traveling speed steplessly by swinging the lever 25 from the neutral groove portion 32 a f) to the far side. , the running latch 36 is constituted by a clutch that is connected and disconnected by electrical operation, and the neutral groove portion 32a of the crank groove 32
Then, the on/off switch L2 of the running latch 36 and the operating piece 40 that operates the switch L2 by contacting the lever 25 that is operated from both end positions of the neutral groove portion 32a toward the center, respectively. The operating latch 36 is arranged so that the moving latch 36 can be operated to cut when the operating piece 40 and the lever 25 come into contact with each other.

Effects of this invention.

By combining the belt-type continuously variable transmission 20, the running latch 36, and the gear-type forward/reverse switching device 28, the fluid pressure type Compared to the case where a continuously variable transmission is provided, the entire traveling device can be constructed at a lower cost, making it economically advantageous.

Shino also allows the three devices mentioned above to be operated in conjunction with one operating lever 25, and the operation is also very simple.

In addition, since the clutch 36 is automatically disengaged when switching between forward and reverse directions, it is not necessary to engage and disengage the clutch 36 each time when switching between forward and reverse directions, and a series of freezing operations can be carried out extremely well. The operation of the latch 36 for running and running is simply done by turning on and off the switch L2, so the operation of the lever 25 is light and easy to handle.

[Brief explanation of the drawing]

The drawings show an embodiment of the running operation structure for an agricultural vehicle according to the present invention, FIG. 1 is an overall side view of a combine harvester, FIG. 2 is a schematic vertical cross-sectional view showing the running drive system, and FIG. 3 is a speed change operating system. The perspective view and FIG. 4 are partially cutaway plan views showing a portion of the operating lever. 20... Belt type continuously variable transmission, 25...
...Operation lever, 33...Forward/reverse/stop switching device, 36...Clutch, E...Engine, 8...Output shaft, 6... ...Traveling device, 28... Forward/forward switching device, 32a...
・Neutral groove part, 32...Crank groove, 39...
... Lever guide frame, 40 ... Operation piece, L2
・・・・・・Intermittent switch.

Claims (1)

[Scope of utility model registration request] The power transmission system between the output shaft 8 of the engine E and the traveling device 6 includes a belt-type continuously variable transmission 20 and a latch 36 that runs from the upper side of the transmission force to the lower side, and a gear-type forward and backward movement. In the running operation structure of an agricultural vehicle in which a switching device 28 is installed in order, one operating lever 25 is pivotally supported so as to be swingable back and forth and left and right, and one end side force of a neutral groove portion 32a along the left and right direction is applied. The lever 25 is inserted into the crank groove 32 of the lever guide frame 39, which is formed by extending a groove part forward from one end and a groove part from the other end to the rear. The lever 25 and the gear-type forward/reverse switching device 2B are linked via a forward/reverse switching mechanism, and the lever 25 is linked only to the forward/backward swinging operation of the lever 25 to prevent the lever 25 from swinging back and forth in the direction away from the neutral position. The lever 25 and the continuously variable transmission device 20 are linked via a speed change operation mechanism that converts to one-way operation, and forward and backward movement is selected by swinging the lever 25 left and right. The neutral groove portion 3 of the lever 25
The latch 36 is configured to steplessly increase the traveling speed by force moving away from the 2a car and swinging toward the side.
consists of a clutch that is connected and disconnected by electrical operation,
An on/off switch L2 of the running latch 36 and the neutral groove portion 32 are provided in the neutral groove portion 32a of the crank groove 32.
The lever 2 is operated from each end position of a toward the center side.
5 for operating the switch L2, and when the operating piece 40 and the lever 25 come into contact with each other, the running latch 36 is turned off. Travel operation structure.